I get no cover image in the resulting .mobi file. Did I miss something?

--addcoverlink will add a cover image in the html file but you have to have a cover image that is found in the lit file. If your lit file is missing a coverimage then you can add one by

Code:

lit2mobi --coverimage cover.jpg myfile.lit

If the thumbnail then do not work you can use the --addthumbnail flag to mobi2mobi. But for Gen3 it should be enough to add the coverimage. I will test this functionality a bit more and fix any problems I find to the next release.